/*
   Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Her Majesty the
   Queen in Right of Canada (Communications Research Center Canada)

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "crc.h"
#include <stdio.h>
#include <fcntl.h>

//#define CCITT       0x1021

namespace odr{

	uint8_t crc8tab[256] = {
		0x00, 0x07, 0x0e, 0x09, 0x1c, 0x1b, 0x12, 0x15,
		0x38, 0x3f, 0x36, 0x31, 0x24, 0x23, 0x2a, 0x2d,
		0x70, 0x77, 0x7e, 0x79, 0x6c, 0x6b, 0x62, 0x65,
		0x48, 0x4f, 0x46, 0x41, 0x54, 0x53, 0x5a, 0x5d,
		0xe0, 0xe7, 0xee, 0xe9, 0xfc, 0xfb, 0xf2, 0xf5,
		0xd8, 0xdf, 0xd6, 0xd1, 0xc4, 0xc3, 0xca, 0xcd,
		0x90, 0x97, 0x9e, 0x99, 0x8c, 0x8b, 0x82, 0x85,
		0xa8, 0xaf, 0xa6, 0xa1, 0xb4, 0xb3, 0xba, 0xbd,
		0xc7, 0xc0, 0xc9, 0xce, 0xdb, 0xdc, 0xd5, 0xd2,
		0xff, 0xf8, 0xf1, 0xf6, 0xe3, 0xe4, 0xed, 0xea,
		0xb7, 0xb0, 0xb9, 0xbe, 0xab, 0xac, 0xa5, 0xa2,
		0x8f, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9d, 0x9a,
		0x27, 0x20, 0x29, 0x2e, 0x3b, 0x3c, 0x35, 0x32,
		0x1f, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0d, 0x0a,
		0x57, 0x50, 0x59, 0x5e, 0x4b, 0x4c, 0x45, 0x42,
		0x6f, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7d, 0x7a,
		0x89, 0x8e, 0x87, 0x80, 0x95, 0x92, 0x9b, 0x9c,
		0xb1, 0xb6, 0xbf, 0xb8, 0xad, 0xaa, 0xa3, 0xa4,
		0xf9, 0xfe, 0xf7, 0xf0, 0xe5, 0xe2, 0xeb, 0xec,
		0xc1, 0xc6, 0xcf, 0xc8, 0xdd, 0xda, 0xd3, 0xd4,
		0x69, 0x6e, 0x67, 0x60, 0x75, 0x72, 0x7b, 0x7c,
		0x51, 0x56, 0x5f, 0x58, 0x4d, 0x4a, 0x43, 0x44,
		0x19, 0x1e, 0x17, 0x10, 0x05, 0x02, 0x0b, 0x0c,
		0x21, 0x26, 0x2f, 0x28, 0x3d, 0x3a, 0x33, 0x34,
		0x4e, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5c, 0x5b,
		0x76, 0x71, 0x78, 0x7f, 0x6a, 0x6d, 0x64, 0x63,
		0x3e, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2c, 0x2b,
		0x06, 0x01, 0x08, 0x0f, 0x1a, 0x1d, 0x14, 0x13,
		0xae, 0xa9, 0xa0, 0xa7, 0xb2, 0xb5, 0xbc, 0xbb,
		0x96, 0x91, 0x98, 0x9f, 0x8a, 0x8d, 0x84, 0x83,
		0xde, 0xd9, 0xd0, 0xd7, 0xc2, 0xc5, 0xcc, 0xcb,
		0xe6, 0xe1, 0xe8, 0xef, 0xfa, 0xfd, 0xf4, 0xf3
	};


	uint16_t crc16tab[256] = {
		0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
		0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
		0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
		0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
		0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
		0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
		0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
		0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
		0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
		0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
		0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,
		0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
		0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,
		0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
		0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
		0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
		0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
		0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
		0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
		0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
		0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
		0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
		0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
		0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
		0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
		0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
		0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
		0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
		0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
		0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
		0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
		0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0
	};


	uint32_t crc32tab[256] = {
		0x00000000, 0x04c11db7, 0x09823b6e, 0x0d4326d9,
		0x130476dc, 0x17c56b6b, 0x1a864db2, 0x1e475005,
		0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, 0x2b4bcb61,
		0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd,
		0x4c11db70, 0x48d0c6c7, 0x4593e01e, 0x4152fda9,
		0x5f15adac, 0x5bd4b01b, 0x569796c2, 0x52568b75,
		0x6a1936c8, 0x6ed82b7f, 0x639b0da6, 0x675a1011,
		0x791d4014, 0x7ddc5da3, 0x709f7b7a, 0x745e66cd,
		0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039,
		0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5,
		0xbe2b5b58, 0xbaea46ef, 0xb7a96036, 0xb3687d81,
		0xad2f2d84, 0xa9ee3033, 0xa4ad16ea, 0xa06c0b5d,
		0xd4326d90, 0xd0f37027, 0xddb056fe, 0xd9714b49,
		0xc7361b4c, 0xc3f706fb, 0xceb42022, 0xca753d95,
		0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1,
		0xe13ef6f4, 0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d,
		0x34867077, 0x30476dc0, 0x3d044b19, 0x39c556ae,
		0x278206ab, 0x23431b1c, 0x2e003dc5, 0x2ac12072,
		0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16,
		0x018aeb13, 0x054bf6a4, 0x0808d07d, 0x0cc9cdca,
		0x7897ab07, 0x7c56b6b0, 0x71159069, 0x75d48dde,
		0x6b93dddb, 0x6f52c06c, 0x6211e6b5, 0x66d0fb02,
		0x5e9f46bf, 0x5a5e5b08, 0x571d7dd1, 0x53dc6066,
		0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba,
		0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e,
		0xbfa1b04b, 0xbb60adfc, 0xb6238b25, 0xb2e29692,
		0x8aad2b2f, 0x8e6c3698, 0x832f1041, 0x87ee0df6,
		0x99a95df3, 0x9d684044, 0x902b669d, 0x94ea7b2a,
		0xe0b41de7, 0xe4750050, 0xe9362689, 0xedf73b3e,
		0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2,
		0xc6bcf05f, 0xc27dede8, 0xcf3ecb31, 0xcbffd686,
		0xd5b88683, 0xd1799b34, 0xdc3abded, 0xd8fba05a,
		0x690ce0ee, 0x6dcdfd59, 0x608edb80, 0x644fc637,
		0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb,
		0x4f040d56, 0x4bc510e1, 0x46863638, 0x42472b8f,
		0x5c007b8a, 0x58c1663d, 0x558240e4, 0x51435d53,
		0x251d3b9e, 0x21dc2629, 0x2c9f00f0, 0x285e1d47,
		0x36194d42, 0x32d850f5, 0x3f9b762c, 0x3b5a6b9b,
		0x0315d626, 0x07d4cb91, 0x0a97ed48, 0x0e56f0ff,
		0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623,
		0xf12f560e, 0xf5ee4bb9, 0xf8ad6d60, 0xfc6c70d7,
		0xe22b20d2, 0xe6ea3d65, 0xeba91bbc, 0xef68060b,
		0xd727bbb6, 0xd3e6a601, 0xdea580d8, 0xda649d6f,
		0xc423cd6a, 0xc0e2d0dd, 0xcda1f604, 0xc960ebb3,
		0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7,
		0xae3afba2, 0xaafbe615, 0xa7b8c0cc, 0xa379dd7b,
		0x9b3660c6, 0x9ff77d71, 0x92b45ba8, 0x9675461f,
		0x8832161a, 0x8cf30bad, 0x81b02d74, 0x857130c3,
		0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640,
		0x4e8ee645, 0x4a4ffbf2, 0x470cdd2b, 0x43cdc09c,
		0x7b827d21, 0x7f436096, 0x7200464f, 0x76c15bf8,
		0x68860bfd, 0x6c47164a, 0x61043093, 0x65c52d24,
		0x119b4be9, 0x155a565e, 0x18197087, 0x1cd86d30,
		0x029f3d35, 0x065e2082, 0x0b1d065b, 0x0fdc1bec,
		0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088,
		0x2497d08d, 0x2056cd3a, 0x2d15ebe3, 0x29d4f654,
		0xc5a92679, 0xc1683bce, 0xcc2b1d17, 0xc8ea00a0,
		0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb, 0xdbee767c,
		0xe3a1cbc1, 0xe760d676, 0xea23f0af, 0xeee2ed18,
		0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4,
		0x89b8fd09, 0x8d79e0be, 0x803ac667, 0x84fbdbd0,
		0x9abc8bd5, 0x9e7d9662, 0x933eb0bb, 0x97ffad0c,
		0xafb010b1, 0xab710d06, 0xa6322bdf, 0xa2f33668,
		0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4
	};

	void init_crc8tab(uint8_t l_code, uint8_t l_init)
	{
		unsigned i, j, msb;
		uint8_t nb;
		uint8_t crc;

		for (i = 0; i < 256; ++i) {
			crc = l_init;
			nb = i ^ 0xff;
			for (j = 0; j < 8; ++j) {
				msb = (nb & (0x80 >> j)) && 1;
				msb ^= (crc >> 7);
				crc <<= 1;
				if (msb)
					crc ^= l_code;
			}
			crc8tab[i] = crc;
		}
	}


	void init_crc16tab(uint16_t l_code, uint16_t l_init)
	{
		unsigned i, j, msb;
		uint8_t nb;
		uint16_t crc;

		for (i = 0; i < 256; ++i) {
			crc = l_init;
			nb = i ^ 0xff;
			for (j = 0; j < 8; ++j) {
				msb = (nb & (0x80 >> j)) && 1;
				msb ^= (crc >> 15);
				crc <<= 1;
				if (msb)
					crc ^= l_code;
			}
			crc ^= 0xff00;
			crc16tab[i] = crc;
		}
	}


	void init_crc32tab(uint32_t l_code, uint32_t l_init)
	{
		unsigned i, j, msb;
		uint8_t nb;
		uint32_t crc;

		for (i = 0; i < 256; ++i) {
			crc = l_init;
			nb = i ^ 0xff;
			for (j = 0; j < 8; ++j) {
				msb = (nb & (0x80 >> j)) && 1;
				msb ^= (crc >> 31);
				crc <<= 1;
				if (msb)
					crc ^= l_code;
			}
			crc ^= 0xffffff00;
			crc32tab[i] = crc;
		}
	}


	uint8_t crc8(uint8_t l_crc, const void *lp_data, unsigned l_nb)
	{
		const uint8_t* data = (const uint8_t*)lp_data;
		while (l_nb--) {
			l_crc = crc8tab[l_crc ^ *(data++)];
		}
		return (l_crc);
	}


	uint16_t crc16(uint16_t l_crc, const void *lp_data, unsigned l_nb)
	{
		const uint8_t* data = (const uint8_t*)lp_data;
		while (l_nb--) {
			l_crc =
				(l_crc << 8) ^ crc16tab[(l_crc >> 8) ^ *(data++)];
		}
		return (l_crc);
	}


	uint32_t crc32(uint32_t l_crc, const void *lp_data, unsigned l_nb)
	{
		const uint8_t* data = (const uint8_t*)lp_data;
		while (l_nb--) {
			l_crc =
				(l_crc << 8) ^ crc32tab[((l_crc >> 24) ^ *(data++)) & 0xff];
		}
		return (l_crc);
	}

}